23501813997 has 8 divisors (see below), whose sum is σ = 31347468256. Its totient is φ = 15662017872.

The previous prime is 23501813989. The next prime is 23501814013. The reversal of 23501813997 is 79931810532.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23501813997 - 2³ = 23501813989 is a prime.

It is a super-2 number, since 2×23501813997² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23501813297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1455163 + ... + 1471224.

It is an arithmetic number, because the mean of its divisors is an integer number (3918433532).

Almost surely, 2^23501813997 is an apocalyptic number.

It is an amenable number.

23501813997 is a deficient number, since it is larger than the sum of its proper divisors (7845654259).

23501813997 is a wasteful number, since it uses less digits than its factorization.

23501813997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2929067.

The product of its (nonzero) digits is 408240, while the sum is 48.

The spelling of 23501813997 in words is "twenty-three billion, five hundred one million, eight hundred thirteen thousand, nine hundred ninety-seven".